Pattern reversing mechanisms for dobbies



Oct. 3, 1961 c. P. BERGSTROM ET AL 3,002,535

PATTERN REVERSING MECHANISMS FOR DOBBIES 4 Sheets-Sheet 1 Filed April 28, 1960 mm 6 09 mm mm 8 0 H INVENTORS CARL E BERGST-ROM ALBERT ggoem. ND ATTORNEY Oct. 3, 1961 c. P. BERGSTROM ET AL 3, 7

PATTERN REVERSING MECHANISMS FOR DOBBIES Filed April 28, 1960 4 Sheets-Sheet 2 INVENTORS AL BERT OEDERLU N D ATTORNEY CARL P BERGSTROM.

Oct. 3, 1961 c. P. BERGSTROM ET AL 3,002,535

PATTERN REVERSING MECHANISMS FOR DOBBIES Filed April 28, 1960 4 Sheets-Sheet s INVENTO CARL I? BERG OM ALBERT CEDERLUND awzd 7M ATTORNEY Oct. 3, 1961 c. P. BERGSTROM ET AL 3,00

PATTERN REVERSING MECHANISMS FOR DOBBIES Filed April 28, 1960 4 Sheets-Sheet 4 INVENTORS CARL P. BERGSTROM ALBERT CEDERLUND @Mw WM ATTORNEY United States Patent 3,002,535 PATTERN REVERSING MECHANISMS FOR DOBBIES Carl P. Bergstrom, Millbury, and Albert Cederlund, Worcester, Mass., assignors to Crompton & Knowles Corporation, Worcester, Mass, a corporation of Massachusetts Filed Apr. 28, 1960, Ser. No. 25,364 34 Claims. (Cl. 139-324) This invention relates to double indexing dobby looms employing a perforated pattern sheet, and it is the general object of the invention to provide a reversing mechanism for the pattern to change the direction of travel thereof after the pattern has moved a predetermined distance in one or another of twodirections of travel.

Certain types of looms which have gone into extensive use employ rather long pattern sheets driven in one direction to control the shedding operations of the loom. One type of such loom is the towel loom wherein the weave pattern oftentimes requires a considerable length of pattern sheet to complete a single fabric, some of these sheets being as long as 20 feet. In order to apply this length or variable other lengths of pattern to the usual double indexing dobby, there usually must be provided cumbersome and expensive framework which is bolted to the floor and in some cases deriving some support from the ceiling in order to accommodate the long pattern which is supported on the framework in long continuous multiple loops. Because of the cumbersome framework and attendant cost thereof and the continuous loops and the manner in which they are adapted to the loom, a great deal of space is utilized which requires more floor space per loom than is necessary in the present application, as will be pointed out hereinafter. It is therefore an important object of the invention to eliminate the expensive and cumbersome framework by providing a supporting mechanism for the pattern sheet to support the same for movement in two directions in a comparatively small space or area with respect to the loom.

It is another object of the invention to mount the reversing mechanism on the dobby frames in such a manner as to form a pattern reversing dobby unit which derives its support from the loom frame.

Another object of the invention is to provide the reversing mechanism with a train of mechanisms including a train of gears to effect intermittent movement of the pattern sheet to a pattern reading station in equal distant intervals from one end of a predetermined area of perforated and nonperforated parts of the sheet to the other end, the train of mechanisms acting when each end of the area reaches the reading station to first move the pattern one-half the said distant intervals followed by movement to the reading station of the pattern sheet again in said equal intervals but in the opposite direction in which the pattern was previously moved.

Aififier object of the invention is to provide a pair of interconnected reversibly rotatable indexing means including a pair of wheels having teeth and notches and slidably mounted to a support shaft common to a pattern engaging cylinder for corresponding movement with the indexing means to movethe pattern in one of two selectable directions for a predetermined length of time after which the indexing means is reversely automatically rotated to move the pattern in a direction opposite to that direction in which the pattern had previously been moved.

Another object of the invention is to provide control means to slidably move the indexing means from one to another of two occupative positions to be rotated in one direction when in one of the positions and in the opposite direction when in the other of said two positions.

It is another object of the invention to provide a pair of 3,002,535 Patented Oct. 3, 1961 oppositely rotating force applying means, one for each of said indexing means, and operating one at a time to enter the notches of its corresponding wheel to rotate the latter intermittently in the direction that the wheel engaging force applying means is being rotated.

Another object of the invention is to include a drive pin for each of said force applying means to operate one at a time to enter the notches of their corresponding indexing wheel to turn the latter, each pin alternating to engage its corresponding wheel when the pattern has reached an end of said predetermined area at the reading station to effect reverse intermittent travel of the pattern.

Another object of the invention is to include a pivoted yielding lever for each force applying means and to mount the respective pins thereof diametrically opposite each other on one of the levers, the pins extending through a slot in each of said forceapplying means and each pin having an end which first engages the periphery of a tooth of a wheel when a pattern is to be reversed causing the lever and its pin to yield to prevent turning of the wheel and thereafter entering a notch to effect movement of one-half of said distant intervals followed by complete movements thereof.

Still another object of the invention is to provide a rotatable pin wheel and horizontal lever for the aforementioned control means, the wheel having a pair of series of angularly supported wheel pins extending from the periphery of the wheel and each series of wheel pins movable in a plane transverse of the axis of the pin wheel to alternately engage upstanding contacts, one ata time,'on one end of the horizontal lever to move the latter to effect sliding of the indexing means via operative connections between the latter and the other end of the lever.

Still another object of the invention is to provide a pawl and ratchet actuating means for the previously described control means and also shield means therefor to permit and prevent actuation of the control means during certain periods of loom operation.

A further object of the invention is to provide pattern control indicating means including holding means for the shield to effect movement of the latter when the pattern has reached the end of the predetermined area to permit coaction of the pawl and ratchet to actuate the control means to cause shifting of the indexing means to effect a reverse movement of the pattern sheet.

A further object of the invention is to provide a pair of wind-up rolls forming part of the train of mechanisms above described and operating by force transmitting means, also part of said train, to effect simultaneous winding of the sheet on one roll while unwinding from the other roll when the pattern is moving in one direction and operating conversely when the pattern is moving in the opposite direction.

Another object of the invention is to provide slip clutch means for each roll to compensate for the change in diameters of the rolls as they wind up and unwind the sheet, each slip clutch means acting as drive means for its corresponding wind-up roll when the latter is having the pattern wound therearound.

A further object of the invention is to make the pattern sheet with pairs of odd and even rows of perforations having nonperforated parts therebetween and to provide" sheet actuating means to move the pattern from odd to odd rows to a pattern reading station for a predetermined length to weave one-half of a fabric whereafter the means acts to move the pattern reversely from even to even rows for said predetermined length to weave the other half of the fabric, the pattern being provided with a hole in transverse alignment with the last row of holes at one end of the predetermined area and with a hole in transverse alignment with the next to the last row of holes at the other end of said area to initiate movement of said actuating means.

A still further object of the invention is to provide visual aid means for the operator of the loom to signify the direction of travel of the pattern with respect to the or faulty pick.

Still a further bly and thereafter application to the loom as such, it only being necessary to connect a drive chain for the unit to a loom shaft to commence operation of the dobby unit.

With these and other objects in view which will appear as the description proceeds, the present invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein the embodiments of the invention are conveniently set forth,

FIG. 1 is a rear elevational view of a dobby having the invention applied thereto, certain of the parts being broken away,

FIG. 2 is a plan view looking in the direction of arrow 2, FIG. 1, as seen from the right-hand side of FIG. 1,

certain of the parts being in section and certain of the parts being broken away,

FIG. 3 is a fragmentary rear elevation direction of arrows 3, FIG. 2,

FIG. 4 is a vertical section taken on line 4-4, FIG. 2, showing the train of gears utilized to effect movement of the paper pattern in opposite directions,

FIG. 5 is a fragmentary vertical sectional view on lines 5-5, FIG. 4,

FIG. 6 is a transverse section along line 6-6 of FIG. 5,

FIG. 7 is a fragmentary perspective view of the pair of axially spaced intermittently operated indexing means and the locks therefor,

FIG. 8 is an elevational section on line 8-8, FIG. 2, illustrating parts of the control means for the indexing means,

FIG. 9 is a detailed view looking in the direction of arrow 9, FIG. 8,

FIG. 10 is a vertical sectional view on line 1010, FIG. 1, parts being broken away, of one of the pattern wind-up rolls,

FIG. 11 is. a sectional FIG. 10,

FIG. 12 is a front elevation looking in the direction of arrow 12, FIG. 2, illustrating the visual aid means to signify the direction of travel of the pattern with respect to the center of the loom, certain of the parts being in section,

FIG. 13 is a fragmentary plan view of part of the perforated paper pattern shown in FIG. 1, and

FIG. 14 is an enlarged fragmentary partial plan View of the paper pattern showing the relationship of the pattern cylinder teeth with the edge holes.

Referring particularly to FIGS. 1 and 2, a loom frame 1 shown fragmentarily has fixed thereto a block 2 to which a dobby, generally indicated by the letter U and having front and rear dobby plates 3 and 4 respectively, is secured as by bolts 5 A supporting rod 6, journaled in suitable bearings, extends between the plates 3 and 4 looking in the view taken along line 1111,

and pivotally mounts thereon a plurality of harness jacks 7, only two of which are shown, and each of which is operatively connected to the usual harness frame, not shown, to effect vertical reciprocation thereof to form the usual warp sheds. Each jack is provided with a stud 8 to pivotally support a jack back lever 9 intermediate its ends, the lower and upper ends pivotally mounting dobby hooks. 10 and 12 respectively for selective coaction with lower and upper reciprocating knives 13 and 14. respectively. A plurality of individually selectable dobby fingers 14', see FIGS. 2 and 3, located between plates 3 and 4 are operatively connected to a corresponding dobby hook to effect raising or lowering thereof as determined by a movable perforated paper pattern P shown in FIGS. 1 and 13. A cross rod 15 supported at its ends by plates 3 and 4 pivotally mounts the dobby fingers 14' for rocking movement with respect to each other, the right-hand end of the fingers resting on a vertically movable angle iron 16 when in lowered position, see FIG. 3.

Referring particularly to FIGS. 2 and 3, a pair of stands, one on each dobby plate, and generally indicated at 17, supports a series of pattern reading needles 18 under control of the pattern P and singularly depending from a series of dobby fingers supporting hook members generally indicated at 19- and pivoted on a cross bar 20 on stands 17. As can be seen in FIG. 3, each supporting hook member has a horizontal arm 21 and a vertical arm 22 having at its lower end an upwardly curved hook 23 for cooperation with a shoulder 24 formed at the right-hand end of the dobby fingers. A spring 25 for each hook member urges movement thereof in a clockwise direction. A needle lifting bar 26 extends beneath the horizontal arms 21 and is periodically raised to lift the reading needles away from the pattern P to permit movement thereof and thereafter lowered to allow the needles via springs 25 to read the pattern. Each end of the aforementioned angle iron 16 is also periodically raised to lift all the fingers 14 by a pair of lifting rods 27 only one of which is shown in FIG. 3. When the pattern is read, all of the dobby fingers will be in raised position by angle iron 16 and those needles entering per-. forations'will cause their curved hooks 23 to move underneath shoulders 24 of their respective fingers to. maintain them in raised position to effect lowering of corresponding dobby hooks for engagement with their respective knives. The needles that do not enter the perforations will act to prevent their curved hooks from moving beneath the shoulders 25 of their corresponding dobby fingers to effect raising of corresponding hooks out of engagement with their respective knives.

Referring to FIGS. 1 and 2, the plates 3 and 4 have journaled between them a rocker shaft 28, the rear end of which mounts a rocker lever 29 having an arm 30 from the end of which a vertical rod 31 depends. Upper and lower rod heads 32 and 33 respectively are provided to adjust the length of rod 31 with respect to a crank arm 34 fast on a jack shaft 35 rotatably supported on a casting generally indicated at 36 supported to a rear dobby plate 4 in any approved manner. Lower rod head 33 is connected to crank arm 34 by a stud 37 adjustably secured to the crank arm 34 by a nut 38. A sprocket 39 is driven by a chain 40, the lower end of which is trained around-a sprocket on a loom crankshaft (both not shown but well known in the art) such that two revolutions of the crankshaft will cause one revolution of jack shaft 35 to effect, through crank arm 34, alternate reciprocation of knives 13 and 14, each reciprocation representing one pick or beat of the loom as is common in double indexing dobbies. The previously described knives 13 and 1 4 are respectively connected at pivots 42 and 43 on rocker lever 29 by knife connectors 44 and 45 respectively, similar pivots and connectors be ing provided at: the forward end of the vknives. Upper and er back- 1p, a s n 48 t ached: to nd'between the dobby plates act as ba ck up or pivot points for the jack back levers 9 during reciprocation of the selected dobby hooks by their respective knives.

. The matter thus far described is of usual construction and operates in well known manner and forms no part of the present invention except as hereinafter described. Reference is made to Patent 2,856,964 issued to Bergstrom et al. for a further understanding of the operation of needle lifting bar 26 and the selectivity of dobby finger supporting hook members 19 with respect to the dobby fingers 14'.

Referring again to jack shaft 35, the latter has fixed thereto a gear drive means 49 meshing with a gear 50 forming part of a gear train generally indicated at 52, see FIG. 4. Gear 50 is loose on a shaft 53 and meshes with a pinion gear 54 fast on a shaft 55 which fixedly carries thereon another pinion gear 56 meshing with a gear 57 fast on shaft 58 which carries a pinion gear 59 fast thereon to mesh with gear 60, the teeth of gears 50 and 60 being of opposite hand as are gears 50 and 54, 56 and 57, and 59 and 60. The train of gears and their supporting shafts are mounted on a U-shaped bracket 62 forming part of the previously described casting 36. Separators 63 on shaft 53 are located between gears 50 and 60 and between the latter and the upright sides of bracket 62 to prevent lateral sliding of gears 50 and 60 along shaft 53. The relationship of the gears with respect to each other in the train is such that gears50 and 60' rotate in opposite directions during loom operation for a purpose to be described.

Gear 50, see FIGS. 5 and 6, is provided with a closed slot 64 to receive a drive pin 65 having one end thereof extending substantially beyond one side of gear 50 for'a purpose discussed hereinafter. The other end of pin 65 is fastened to lever 66 pivoted as at 67 to gear 50. A spring 68 has one end thereof attached to gear 50 as at 69 and'the other end attached to lever 66 as at 70, the spring acting normally to maintain pin 65 yieldingly in the outer part of slot 64 but permitting movement of the pin in said slot for a reason to be set forth hereinafter. i

Gear 60 is similar in construction to gear 50 and also has a pin 72, a slot 73, a yielding lever 74 and a spring 75, all placed on gear 60 substantially diametrically opposite and similarly with respect to those on gear 50. Gears 50 and 60 and their corresponding pins 65 and 72 may be considered as force applying means for operation one at a time as previously described and shaft 35 and gear 49 may be termed drive means for the force applying means.

U-shaped bracket 62 supports front and rear stationary brackets 76 and 77 respectively, see FIGS. 1 and '2, to rotatably carry the left-hand end of a pattern cylinder shaft 78, the latter being further journaled in front and rear bearing brackets 79 and 80 respectively forming part of the dobby frames 3 and 4 respectively. Shaft 78 has fixed thereto a toothed paper pattern cylinder 82, FIGS. 3 and 14, for driving connection with the pattern P via right and left edge holes 83 and 84 respectively.

Shaft 78 has slidably secured'thereto and for rotation therewith, a pair of interconnected indexing means including a pair of front and back toothed wheels 85 and 86 axially spaced from each other along shaft 78 between brackets 76 and 77. The periphery of wheel 85, see particularly FIG. 7, is provided with teeth 87 and notches 88 therebetween as is wheel 86, the teeth and notches thereof being indicated by the numerals 89 and 90 respectively. A hub 91 connects both wheels for simultaneous sliding and rotation. Wheel 85 is formed with a collar 92 for cooperation with the control means previously mentioned and considered as secondary control means for the indexing means to effect said sliding and to be described hereinafter. Wheel 86 has a connector pin 93 extending therefrom operatively connected to abifurcated lever 94 fast on shaft 78. Pin 93 is of suflicient length to remain in register with lever 94 '6 when the wheels are slidfr om one to another of two selectable positions The teeth of each wheel are staggered with respect to the teeth of the other wheel such that the teeth of one wheel are opposite the notches" of the other wheel and vice versa.

Referring particularly to FIGS. 1 and 7, a pair of spring biased locking means, one for each wheel and 86, includes front and back levers 95 and 96, respectively, each of which has an end pivoted as at 97 to U-shaped bracket 62. Lever 95 is provided with a slidable collar 98 on a short rod 99 fast to the other end of lever 95, and lever 96 has a slidable collar 100 on a short rod 101 fast to the other end'of lever 96. Both collars 98 and 100 respectively are provided with reduced circular portions 102 and 103 respectively between flanges 104 and 105 respectively to alternately ride on the periphery of the teeth of their correspondingwheel and to alternately enter the notches of their corresponding wheels depending upon which position the wheels are in, as will be more fully explained below. A spring S, see FIG. 2, for each lever 95 and 96 yieldingly maintains their respective collars in releasable locked relationship with their corresponding wheels.

The control means, referred to hereinbefore, includes a pin wheel 106 normally having a unidirectional rotation and a horizontal lever 107 actuated thereby, see FIGS. 2, 8 and 9. Pin wheel 106 is mounted for rotation with a crossshaft 108 rotatably held in bearings 109 on plates 3 and 4-. A pair of series of upstanding pins 110 and 111 protrude from the periphery of pin wheel 106 radially from the axis thereof and are so related with respect to each other that the pins 110 in one series move in a plane P1, see FIG. 9, transverse of the axis of shaft 108 and the remainder of the pins 111move in a plane P2 spaced from and parallel to plane P1, the pins in one plane being in staggered angular relationship circumferentially with the pins in the other plane.

Lever 107 is pivoted as at 112, FIG. 2, and is provided with a pair of upright contacts in the form of back and front arcuate shoes 113 and 114 respectively which are spaced from each other, FIG. 9, in a direction parallel to the axis of shaft 108 for engagement respectively with pins 110 and 1111 one at a time to alternately swing lever 107 to effect sliding of the indexing means from one to another of two occupiable positions when pin wheel 106 is rotated. A slot 115 in lever 107 permits pins 110 and 111 to bypass the lever during rotation of the pin wheel. Each of the pins 110 and 111 act one at a time when in slot 115, see FIGS. 8 and 9, to hold lever 107 and the indexing means in one of two occupative positions until the holding pin is moved due to rotation of pin wheel 106 whereupon another pin will move the lever and thereafter act as holding means for the lever, the previously holding pin being moved out of the slot and away from the lever. One end of lever 107 is provided with a vertical pin 116, FIG. 2, for operative connection with the previously described collar 92. Each shoe 113 and 114 has a curved lower part 117 and 118 respectively for engagement with pins 110 and 111 to pivot lever 107 to prevent jamming of the latter by pins 110 and 111 if rotation of pin wheel 106 is inadvertently reversed by a loom operator during stoppage of theloom.

A reciprocable pawl and ratchet actuating or primary control means for the secondary control means can be seen in FIGS. 1 and 2 wherein the left-hand end of shaft 108 fixedly mounts thereto the ratchet 119 having the same number of teeth 120' as there are pins 110 and 111. The reciprocable pawl-122 for engagement with teeth 120 is adjustably'secured to a pawl holder 123 pivoted at 124 to the lower end of rocker lever 29 for reciprocation thereby. Pawl 122 is made with a curved surface 125 the lower end of which engages a curved laterally extending part 126 of a movable shield means 127 pivotally. held on shaft 108 during rocking of the lower end of rocker lever 29, FIG. 1, to prevent the pawl from imparting rotational movement to ratchet 119 until the shield is moved.

Shield 127 is provided with a screw 128 for the right end of a rod 129, the left end thereof being connected to the core 130 of a solenoid 131 on a stand 132 fixed to dobby plate 4. A return spring 133 holds the pawl yieldingly in a position to guard teeth 120 against driving engagement by a lug 134 on pawl 122 to effect nonworking strokes thereof but upon energization (described later) of solenoid 131, core. 130 will move into the solenoid to cause movement of the shield in a direction to expose certain of the teeth 120 one of which will be engaged by lug 134 when the latter moves to the right, FIG. 2, to partly turn ratchet 1'19 and pin wheel 106 simultaneously to swing lever 107 from one to another of two occupiable positions to effect sliding of the indexing means also from one to another of two occupiable positions.

Solenoid 131 is electrically connected in any approved manner to a switch 135 on a part of stand 17, see FIGS. 2' and 3, and it is deemed sufiicient to state herein that closure of the switch will complete a circuit to energize the solenoid to attract its core 130 and and compress the spring previously described to move the shield to the left, FIG. 1, and that upon opening of the switch the circuit will be broken, the solenoid deenergized and the spring expanded toreturn the. shield to the position shown in FIG. 1. Solenoid 131, core 130, rod 129 and spring 133 may be considered as holding means for the shield means 127.

Switch 135 has a normally raised switch arm 136 for engagement with a bridging element 137 secured to a paper pattern reading unit generally indicated by the reference number 138, see FIG. 3. The reader unit 13.8 includes a needle 139 suspended from a horizontal arm 140 having a bearing part 141 trained partially around the previously described cross bar and also includes a short vertical arm extending downwardly from the bearing. The unit 138 is similar to dobby finger supporting hook members 19 and their reading needles 18 and is also raised and lowered by lifting bar 26 to periodically read the paper pattern. Unit 138 does not have a hook for cooperation with a dobby finger and is utilized for a different Purpose, to be described, than that for which hook members 19 and needles 18 are used. Switch 135 and reading unit 138 are to be considered as pattern controlled indicating means.

FIG. 12 illustrates a perforated paper pattern utilized in the present instance but not necessarily limiting the invention for use therewith, the pattern being shown as an example of one of many that can be conveniently employed in the present instance. The pattern P is provided with perforated parts in the form of through holes 142 and nonperforated parts 143 located between the holes 142. Holes 142 are arranged in odd and even pairs of transverse rows, the odd rows being designated by OR and the even or intermediate rows are indicated by ER. The ends of the pattern P are provided with nonperforated leaders 144 and 145 of substantial lengths and are attached to wind-up rolls generally indicated at 146 and 147 respectively to be described. The perforations 142 and the nonperforated parts therebetween in longitudinal row A control the activity of the box motion (not shown, but well known) and the remainder of holes 142 and the nonperforated parts 143 therebetween control the warp shedding previously described to weave a fabric and are located in a predetermined area defined by lines B, C, D and E. The pattern P is also provided with a pair of holes 148 and 149, hole 148 being in transverse alignment with the last row of transverse holes 142 adjacent the beginning of the nonperforated leader 144 and hole 149 being in transverse alignment with the next to the last row of transverse holes 142 adjacent the start of the nonperforated leader 145. Holes 148 and 149v are. also in longitudinal alignment with each other and a nonperforated part 150 longitudinally therebetween cooperates with a unit 138 to effect closure or nonclosure of switch 135 depending upon whether reading needle 139 enters holes 148 and 149 or engages nonperforated part 15.0. Edge holes 84 have straight upper and lower edges 152 and 153 respectively to engage the teeth 154 of rectangular cross section on one end of pattern cylinder 82, see FIGS. 3 and 14. The usual holes 83 receive the usual teeth 155, see FIG. 14, of circular cross-section to prevent lateral displacement of the pattern and to aid in moving the latter.

The previously described toothed wheels 85 and 86 may respectively be considered as primary and secondary rotatable means and gear 50 and its pin 65 with gear 60 and its pin 7 2 may be considered respectively as primary rotating drive means for the primary and secondary rotatable means respectively, gear 5.0 and pin 65 effecting movement of the pattern clockwise or in the direction of arrow 0 to first utilize the odd pairs of rows OR of holes and gear 50 and 60 effecting movement of the pattern counterclockwise in the direction of arrow e to utilize the even pairs of rows ER of holes, see FIG. 13.

The previously described cross-shaft 108, see FIGS. 2 and 12, has attached to the right end thereof a signifying disc 156 inscribed with indicia thereon, as clearlyshown in FIG. 12., to signify the direction of travel ofthe pattern P with respect to the center of the loom (not shown). The in indicia indicates that the pattern is. traveling toward the center of the loom and the out indicia indicates that the pattern is traveling away from the center of the loom. A lever 1'57 pivoted on a stud 158 on plate 3 and positioned horizontally by a stop 159 is. provided with a window 160 through which only one of the indicia can be read, the reading thereof signifying the direction of movement of the pattern and is of visual aid means to the loom operator to determine which direction the pattern P should be moved by manual opera ation in the event correction of a faulty pick is necessary. It will be noted that the amount of indicia coincides with the amount of pins 110 and 111, the in indicia corresponding to the pins 110 passing through plane P1 and the out indicia corresponding to the pins 111 passing through plane P2 during loom operation.

The previously mentioned wind-up rolls 146 and 147 are quite similar in structure and mounting and it is deemed therefore sufficient to describe only one of the rolls, namely roll 147, see FIGS. 1, 10 and 11. Roll 147 includes a barrel 162 having attached thereto at the forward and rear end thereof a plate 163 and 164 respectively to confine the pattern P therebetween during winding and unwinding thereof. Leaders 144 and 145, see FIG. 13 are clamped to the barrels of rolls 146 and 147 respectively in any approved manner. A transverse shaft 165 is supported in bearing stands 166, 168 and 169 attached partly to the dobby plates and partly to the previously described casting 36. Plate 163 is con nected to a driving hub member 170 by connecting pins 172 only one of which is shown in FIG. 10. The lefthand end of sleeve 170 is encircled by a gripping element comprising a resilient circular claw 173 from which a U-shaped bent end extends to form a hook 174 having a slot 175 to receive one end of a connecting cross pin 176 which passes through a ratchet wheel 177 loose on shaft 165. The other end of the connecting cross pin 176 passes through a slot 178 in a U-shaped hook 179 of a second gripping element having a resilient circular gripping claw 180, similar to claw 173, trained around the hub 182 of a sprocket 183 loose on shaft 176. A holding pawl 184 pivoted on stand 168 engages the teeth 1 85 of ratchet 177 to prevent rotation thereof in a counterclockwise direction, as viwed in FIG. 11, but permits rotation cl ckwise. The ra che pping: elem nts 173 and respectively, coact with the left-hand end of sleeve 170 and hub 182 and may be considered as slip clutch means for the pattern sheet. H

Wind-up roll 146 is similar instructure to that of wind-up roll 147 and need not be described in detail and it is deemed suflicient to state that the roll 146 is also provided with a slip clutch means (not shown) on a transverse shaft 186, FIG. 1, one end thereof being proadded with a sprocket 187 similar to sprocket 183. A pawl and ratchet wheel 188 and 189 respectively form part of the slip clutch means and acts reversely of that of pawl and ratchet 184 and 177.

A driving chain 190 is trained around sprockets 183 and 187 and also around a sprocket 192 on the previously described cylinder shaft 78. Clockwise rotation of shaft 78, FIG. 1, will cause the slip clutch means onshaft 165 to drive barrel 162 to eifect winding of the paper pattern on barrel 162 while causing the slip clutch means on shaft 186 to have relative motion between its parts due to pawl 188 acting to hold ratchet 189 'with resultant unwinding of the pattern from the barrel of roll 146. [he operation just described will act conversely when the cylinder shaft is rotated counterclockwise, i.e., the slip clutch means on shaft 186 will drive the latter to efiect a wind-up of the pattern on the barrel of roll 146 and unwinding from barrel 162 through the slip clutch means thereon. Chain 190, sprockets 18 3 and 187 and sprocket192 on shaft 78 may be considered as a sprocket and chain system or a force transmitting means between rolls 146, 147 and shaft 78 to turn the rolls in the direction the rotatable indexing means are rotated to effect a winding of the paper pattern on one of the rolls while simultaneously effecting unwinding of the pattern from the other roll.

The train of mechanisms referred to hereinbefore include thepeviously described jack shaft 35, the gear train 52, the indexing means and the control means therefor, the actuator and shield means for the control means and the wind-up rolls 146 and 147 and their connections to the pattern cylinder shaft 78.

During loom operation, chain 40 will be driven by a sprocket on the crankshaft of the loom as is usual to turn shaft 25 one-half a revolution for each complete revolution of the crankshaft. Each revolution of shaft 35 therefore is equivalent to two picks of the loom or a back and forth reciprocation of each of the knives 13 and 14 by crank arm 32, rod '31 and rocker arm 29. It is to be noted that rocking of rocker arm 29 by crank 32 is but one example to reciprocate knives 13 and 14 and that other means may be used such as a long connector indicated generally at LC by dot and dash lines, FIG. 1, and which extends from arm 30 to a crank arm or a cam on the bottom shaft of the loom as is well known in the art to reciprocate the knives in the same time relationship as does crank arm 32.

Turning of shaft 35 causes gear 49 to operate gear train 52 so that gears 50 and 60 rotate in opposite directions toact one at a time to apply a turning force respectively to the indexing wheels 85 and 86 to intermittently rotate the latter repeatedly first in one direction and then in the opposite direction for a predetermined amount of movement of the paper pattern P. Wheels 85 and 86 are slidable along cylinder shaft 78 and are capable of occupying for a period of time one of two positions on the shaft, and at the end of said period an automatic change in position is automatically effected by pin wheel 106 and horizontal lever 107. Referring to FIG. 2, it will be seen that wheel 86 is adjacent gear 60 and wheel 85 slightly laterally spaced from gear 50 in a staggered relationship such that one end of drive pin 72 of gear 60 extends through slot 73 thereof 'beyond one side of gear 50 to be in alignment with the teeth and notches of wheel 86 while one end of the drive pin 65 of gear 50 although extending through slot 64 thereof beyond one side of gear 50, the end is out of alignment with the teeth and notchesofgear 50 until the wheel 10 is shifted axially to be adjacent gear 50 whereby pin 65 will be in alignment with the notches of wheel 85. When wheel 85 is shifted wheel 86 will also be shifted because of interconnecting hub 91 and gear-60 and its pin 72 will be spaced laterally from wheel 86 and out of alignment with the notches thereof.

When gear 60 and wheel 86 are in relationship shown in FIG. 2, wheel 86 will be moved by pin 72 ina counterclockwise direction as viewed in FIG. 1 and the pattern moved in the direction. of dotted-line arrow e to progressively present the even rows of holes ER, FIG. 13, to a reading station RS, see FIG. 3, in distant intervals as represented by the dotted line arcs DA to weave half the fabric. When the fabric has reached the end of the predetermined area of the pattern as represented by line C, the reading needle 139 of pattern reading unit 138 will enter hole 149 whereupon switch 135 will be closed to complete a circuit to energize solenoid 131 to eifect movement of shield !127 to the left, FIG. 1, to expose the upper teeth of ratchet 119 for engagement with pawl 122 during motion to the right thereof to turn the ratchet clockwise one-eighth of a revolution. Turning of the ratchet effects turning of pin wheel 106 clockwise and a pin 110 in plane P1 while turning about the axis of the pin wheel will engage upstanding horn 114 to shift lever 107 clockwise, FIG. 2, to place wheel 85 adjacent gear 50 and in alignment with force applying pin 65. Turning of ratchet 119 also effects rotation of ind-icia disc 156 to present an indioia to of travel of the paper with respect to the center of the loom.

When pin 65 first engages wheel 85, it will engage the periphery of a tooth which will cause, by continued rotary motion of the pin, arrow b, FIG. 5, the pin to move radially toward the axis of gear 50 in slot 64 by yielding of lever the pin has passed the engaged tooth, it will enter a notch 88 to give the wheel a partial rotation equal to one-half the distant intervals between pairs of odd or even rows of holes, and the pattern will also move one-half the distance as represented by the full-line arc FLA whereafter the pin will act normally to move the paper clockwise, full-line arrow 0, from even to even rows of holes as represented by full-line arcs FA, see FIG. 13, to weave the other half of the fabric.

When the paper has traveled the full complement of the even rows of holes, reading needle 139 will enter hole 148 to initiate a change in direction of movement of the pattern through the previously described switch, solenoid, ratchet, pinwheel and sliding wheels 85 and 86, the first motion of the pattern again being one-half the distant intervals as represented by dotted-line arc DLA.

Each drive pin 65 and 72 will engage its corresponding toothed wheel once for each rotation of their respective gears, and, in order to move from the even row of holes to the odd row of holes and vice versa, the teeth and notches of one wheel are staggered in angular relationship with the teeth and notches of the other wheel whereby the drive pins, because of their diametrically mounted relationship, will first engage the periphery of a tooth of its corresponding wheel to effect movement of onehalf the normal travel of the pattern from odd to odd or even to even rows of holes, as the case may be.

In order to avoid excessive rotation of the wheels 85 and 86 and excessive movement of the pattern, lock levers 95 and 96 act one at a time to yieldingly lock their respective wheels at the end of a turning motion to prevent said excess movement thereof but yield to permit rotation of the wheels during loom operation. As shown in FIG. 7, reduced circular part 103 of collar 100 is in a notch and reduced circular part 102 of collar 98 is on the periphery of a tooth, and this relationship will remain until the wheels are shifted along shaft 78 whereupon the relationship will be reversed; The flanges 104 and 105 are of sufficient diameter to straddle the sides the window to signify the direction 66 clockwise about its pivot 67. After 7 of their respective wheels and when shifting thereof occurs, the collars will shift laterally on their respective short rods 99 and 101 and remain in registry with their wheels when they are in one or the other of two occupyable positions.

During movement of the pattern clockwise and in the direction of arrow the wind-up rolls will be rotated by chain 190, and roll 147 acting through its slip clutch; as a drive will cause winding of the pattern thereon while h pattern unwinds from roll .4 hrough its lip clut h means. When the pattern moves counterclockwise, the rever e pro edure to ha inst escribe of Wind n P and unwinding the pattern will occur; and the. slip clutch means will act conversely to effect Winding of th pattern on roll 146 and unwinding from roll 147,

Turning of the indexing means 85 andv 96 causes turning of the pattern cylinder around which the pattern is trained and, as noted in FIG. 14, the teeth 154 are sub? t n i Hy of he m ro c ion o the hol s an the leading edges of the teeth are in engagement with the edges 152 and 153 so that a line H made along which the pres-sure of the drive of the, teeth 154 is distributed. Because the pattern is driven in two directions, Wearing of the edges 152 and 153 is reduced in half resulting in a longer-lasting pattern sheet.

During operation of the loomrthe supporting hook members 19 and their reading needl m will be. moved periodically by lifting bar 26, as unit 138 and its reading needle 139, away from the pattern during which time the pattern will be moved in RS after which the reading needles Will descend to read the pattern to control the warp shedding for two picks or, as commonly known, a double index indication with the exception of unit 138 which effects an initiation of a change in the direction of travel of the pattern when reading needle enters one or another of the holes 148 and 149. In this respect unit 138 in combination with lifting bar 26 differ in function from members 19 and lifter bar 26 in their warp shedding control function and they form no part of the present invention only insofar as bar 26 cooperates with unit 1358 to raise and lower the latter to read the pattern to indicate or prevent initiation of said change depending upon whether the unit enters a hole or engages a nonperforated part of the pattern.

From the foregoing, it will be seen that the invention provides simple means to automatic-ally reverse the direction of travel of a pattern after the latter has moved a in either one of two directions,

pattern in one direction from odd to odd pairs of rows of holes, intermediate the odd rows, to the station to weave the other half of the fabric. Also, it will be seen that the train of mechanisms include a pair of wind-up rolls, one of which operates to wind up the pattern and the other operating simultaneously to unwind the pattern when the latter is moved in one direction and operating conversely when the pattern is moved in the opposite direction. Moreover, the pattern is provided with means to indicate a change in direction of such that the latter, upon indication, will first have a movement of one-half the distance between odd pairs of rows of holes or even pairs of rows of holes, whereafter the pattern will be moved from odd to odd or even to even rows as the case may be. Also, the train of mechanisms is supported by the dobby plates in a manner to form a unit dobby occupying a comparatively small space, see FIG. 1, and capable of bench assembly and application to the loom frame as a pattern reversing dobby unit. Further, the unit is provided with visual aid means for the loom operator to signify the direction of travel of the pattern with respect to the center of the loom to designate the direction for manual movement of the pattern by the 1,2 operator during loom stoppage to correct a fault in the fabric.

Having now particularly described and ascertained the nature of the invention and in what manner the same is to be performed, what is claimed is:

1. In a loom dobby having a pattern cylinder for a paper pattern having perforations therein, reversibly rotatable. indexing means slidably mounted on a shaft common to said cylinder to effect rotation thereof, oppositely turning force applying means for independent engagement with said indexing means, to cause reverse rotation thereof, drive means for said force applying means, control means to effect sliding of said indexing means incident to said reverse rotation, movable shield means for said control means to prevent and permit operation thereof, pattern controlled indicating means cooperating with certain of said perforations to effect movement of said shield means, and actuating means for said control means to actuate the latter when said shield is moved due to indication by certain of said perforations to cause sliding of said indexing means from operable connection with one of said force applying means to operable connection with another of said force applying means whereby rotation of said indexing means is effected in a direction reverse to that when i said indexing means was rotated by said one of said force applying means.

2. In a loom dobby having a movable, pattern cylinder to move a perforated paper pattern in the same direction of movement of said cylinder, a pair of reversibly rotat-v able indexing means slidably secured to a shaft common to said cylinder to change the direction of rotation thereof after a predetermined amount of cylinder movement in one direction, a pair of oppositely turning force applying means each of which engages said indexing means one at a time and each of which causes rotation of said indexing means in a direction reverse to that caused by the other force applying means, intermittently operated control means operating incident to said change in direction of rotation of said cylinder to slide said indexing means from one to another of two positions for engagement by one of said force applying means to effect said change, movable shield means for said control means to move from one to the other of two positions to respectively positions to effect sliding of said indexing means out of engaging position with one of said force applying means and into engaging position with the other force applying means, and means to return said shield to said one of said two positions after said shield controlled actuating means has moved said control means to prevent further operation thereof until said shield is again indicated for movement by said indicating means.

3. In a loom dobby having a pattern cylinder to move a pattern having perforated and nonperforated parts, a

aooasss positions until moved to the other position, primary control means for said secondary control means and normally at'rest but rotatable to effect movement of said secondary control means, normally stationary shield means for said primary control means movable from a normal to an abnormal position and back again, movable holding means for said shield means, indicating means under control of the pattern to eifect movement of said holding and shield means to permit rotation of said primary control means, and actuating means normally having back and forth idle strokes during loom operation but capable of engaging said primary control means to rotate the latter upon movement of said shield means to its abnormal position to effect movement of said secondary control means to cause sliding of said pair of intermittentlyoperated means from one of said two positions to the other position for operable connection with its corresponding force applying means whereby the paper pattern is moved in a direction opposite to that in which it had previously been moved.

4. The loom dobby set forth in claim 3 wherein said intermittently operated indexing means includes a pair of toothed wheels joined by a spacing element to effect simultaneous sliding of said wheels when acted upon by said secondary control means and simultaneous rotation of said wheels when acted upon by either of said force applying means, the teeth of one wheel being angularly staggered in relationship with the teeth of the other wheel.

5. The loom dobby set forth in claim 4 wherein each wheel has a notch between each pair of teeth and each tooth of each wheel is opposite a notch in the other wheel.

6. The loom dobby set forth in claim 3 wherein said support and said intermittently operated indexing means are provided with coacting operative connections therebetween to maintain said support and said indexing means constantly interconnected, and wherein said intermittently operated means is also provided with an operative connection to said secondary control means. i

7. The loom dobby set forth in claim 6 wherein the operative connections between said support and said indexing means includes a slotted lever fast on said support and a short rod fast on said indexing means and extending into said slot in a manner to permit sliding of said indexing means from one to another of said two positions without losing registry with said slot, said rod being capable of transmitting rotary motion through said slotted lever to said support when said intermittently operated means is rotated by either one of said force applying means.

8. The loom dobby set forth in claim 6 wherein the operaitve connection on said intermittenly operated means to said secondary control means is a grooved collar fast with respect to said intermittently operated means for sliding and rotating movement therewith.

9. The dobby set forth in claim 3 wherein each of said force applying means includes a gear having a closed slot therein, a stud for said slot and on a lever pivoted on said gear, and resilient means to yieldingly maintain said stud at the outer end of said slot, said stud extending through said slot and having a portion thereof to engage said intermittently operated means to cause rotation thereof.

10. The dobby set forth in claim 9 wherein the stud of one of said force applying means is normally diametrically opposite the stud of the other of said force applying means.

11. The dobby set forth in claim 3 wherein each of said force applying means is mounted freely on a common shaft parallel to and spaced from said support and so related axially with respect to said indexing means that when either one of the said force applying means engages one of said indexing means the other force applying means has an idle motion.

12. The dobby set forth in claim 3 wherein each of said force applying means is mounted on a shaft and axially spaced therealong with respect to each other and operativelv interconencted by a train of gears which causes '14 opposite turning of one of said force applying means with respect to the other.

13. The dobby set forth in claim 3 wherein said driving means includes a gear operatively connected to one of said pair of force applying means to effect rotation of each of said force applying means in directions opposite to each other during loom operation.

14. The dobby set forth in claim 3 wherein said secondary control means includes a pin wheel fixed to a cross shaft and having a series of angularly spaced pins extending from the periphery thereof arranged in two planes transverse of said cross shaft and wherein said secondary control means also includes a lever pivotally mounted between its ends, one end of which is formed with contactable members capable of alignment with and contact by said pins, one at a time, and the other end of which is operatively connected to said intermittently operated means. 1

15. The dobby set forth in claim 14 wherein said members icnlude a pair of transversely spaced upstanding horns extending on each side of said lever and each of which is provided with a curved surface for engagement with certain of said pins, said horns being adjacent a slot in said lever for passage of said pins therethrough, and said horns being disposed with respect to said two planes such that when the pins in one of said two planes align with a surface of one of said horns, the other pins in the other plane align with said slot.

16. The dobby set forth in claim 3 wherein said primary control means is a ratchet wheel fixed with respect to and on a shaft common to said second control means and rotatable in a direction to cause rotation of said secondary control means in said direction to eifeet sliding of said indexing means from one to another of said two positions as said wheel is rotated.

17. The dobby set forth in claim 3 wherin said normally stationary shield means includes a vertical lever pivotally mounted at its lower end with respect to said primary control means and having at its upper end an arcuate plate extending laterally therefrom over a portion of said primary control means to form a guard therefor which when in its normal position prevents rotation of said primary control means and which when in an abnormal position permits rotation of said primary control means.

18. The dobby set forth in claim 3 wherein said movable holding means includes a solenoid having a core and normally deenergized and a spring presser connector connected to and between the core and said shield means and biased by said spring to maintain said shield means yieldingly in its normal position but movable against the force exerted by the spring when said solenoid is energized to move said shield means to said abnormal position.

19. The dobby set forth in claim 3 wherein said indicating means includes a normally open switch having a switch arm, a pivotally mounted pattern reading unit movable away and toward said pattern and having a substantially horizontal support arm and a vertically disposed reading needle depending therefrom and movable to engage said nonperforated parts and to enter said perforated parts as the case may be, and a bridging element having one end thereof fixed to said support arm and the other end thereof extending to said switch arm for engagement therewith to close said switch when said needle enters certain of said preforated parts to effect movement of said holding means, said bridging element being prevented from engaging said switch arm when said needle engages said nonperforated parts.

20. The dobby set forth in claim 3 wherein said actuating means includes a lever pivoted intermediate its ends for constant reciprocation during loom operation having operative connections between said lever and said primary control means having one end pivotally supported by said lever and the other end capable of riding freely from said primary control means onto said normally stationary shield means and back again during said reciprocation,

said p rati e q n q i n i clu i a pp i arm pivoted at one end to said lever and an actuating pawl having a straight part for adjustable securement to said arm and a downwardly curving part between said straight part and said other end for engagement with said stationary guard means to facilitate movement of said other end onto said guard means.

21. In a loom dobby having a reciprocating rocker arm and operating with a movable perforated paper pattern, an actuator on said arm normally having a nonworking stroke during reciprocation of said rocker arm but capable of having a working stroke in one of said directions after a predetermined amount of travel of said pattern to effect reversal of travel thereof for said amount, a pair of wind-up rolls for said pattern forming part of the dobby and operating simultaneously in one direction to wind up the pattern on one of said rolls while letting off from the other roll for said predetermined amount of travel and thereafter operating in a reverse manner for the same predetermined amount, a train of mechanisms between said actuator and said wind-up rolls to move said paper pattern, and indicating means under control of the paper pattern and between the latter and' said train of mechanisms to effect a wor 'ng stroke of said actuator to set said train of mechanisms to cause a reversal of direction of travel of said pattern at the end of each predetermined amount of travel of said pattern.

22. In a dobby operating with a pattern cylinder to move a perforated pattern, a pair of rotatable wheels each having a series of notches along its periphery and operatively connected to said cylinder for simultaneous rotation therewith, an intermittently rotatable shaft for and common to said cylinder and said wheels, a pair of wind-.up rolls for said pattern, a pair of oppositely moving force applying drive pins, one for each of said series of notches, to alternate rotation of said pair of wheels, and force transmitting means operatively connected to and between said shaft and said wind-up rolls to effect rotation of the latter in the same direction of rotation of said wheels and said pattern cylinder when said pins apply a force to rotate said wheels.

23. The dobby set forth in claim 22 wherein said force transmitting means includes a sprocket on said shaft, a sprocket operatively connected to each of said wind-up rolls, and a chain trained around and interconnecting said sprockets to transmit motion from said shaft to said windup. rolls.

fected, a pair of oppositely rotating drive pins, one for of simultaneously rotatable of which has an end of said paper pattern attached thereto, paper patt rn. r a ng a s un e control of the p p r pa t n selective to initiate sliding of said wheels whereby one of said wheels is slid to a position for engagement with one of said pins and the other wheel is slid to a position out of engagement with the other pin to effect automatic reversal of rotation of said wheels, and a sprocket and chain system between Said rolls and said shaft to turn said rolls in the direction said wheels are rotated to effect a winding of the paper on one of said rolls and simultaneous unwinding of the paper from the other roll.

25., in a loom dobby operating with a movable pattern y nder fast on a of movement of said cylinder, a pair of interconnected axially spaced notched wheels slidably secured to said cylinder shaft to slide from one to another of two occupative positions for simultaneous intermittent rotation in one direction when in one of said two positions and intermittent simultaneous rotation in a direction opposite to said one direction when in the other of said two positions to rotate said cylinder in the same direction the wheels are rotated, intermittently operated control means to slide said wheels from one to the other of said two occupative positions when said pattern has reached either end of said predetermined length to effect a change in direction of movement of said pattern, a pair of oppositely rotating drive pins, one for each wheel, to enter the notches of the wheels one at a time to change the direction of rotation of said cylinder subsequent to occupancy of said wheels in either one of said two occupative positions, a pair of wind-up rolls for said pattern mounted on individual shafts and movable in the same direction of movement of said pattern and having driven connections with said cylinder shaft for rotation therewith to effect winding and unwinding of said pattern with respect to said rolls with resultant changes in the diameters thereof, operative connections for and between each roll and said driven connections and rotatable with said cylinder in the same direction of rotation thereof, and slip clutch means on each of said individual shafts and for each roll to compensate for said changes in diameters during winding and unwinding of said pattern on and from said rolls. 26. The loom dobby set forth in claim 25 wherein said operative connections include a sprocket on each of said individual shafts meshing with a chain driven by said cylinder shaft, a hub member for and secured to each roll and on each of said individual shafts, driving means for each roll including said slip clutch means and a ratchet between said sprocket and said hub member to drive its corresponding roll to wind said pattern thereon, and a holding pawl coacting with said ratchet to maintain said driving means stationary to effect relative movement between said driving means and said hub member when said pattern is being unwound from said corresponding roll.

27. The loom dobby set forth in claim 26 wherein said slip clutch means for each roll includes a pair of gripping elements, one on each side of said ratchet respectively for each sprocket and each hub member, each of said elements comprising a resilient circular claw to slippingly grip respectively a hub on said sprocket and said hub member and having a bent end extending therefrom to form a U-shaped hook, and a connecting pin passing through said ratchet and into the hook of each element. 28. In a loom dobby operating with an intermittently movable pattern cylinder to move a pattern a selected normal distance at regular recurring intervals throughout the length of said pattern, a pair of slidable wheels having notches across the peripheries thereof and intermittently rotatable in two directions to turn the cylinder in whatever direction said wheels are rotated, a pair of notch entering drive pins, one for each wheel, and acting one at a time to rotate said wheels in opposite directions, a pair of oppositely rotating supports, one for each pin, and each having a slot therein to receive therethrough one of said pins in diametrical opposite relationship to the other pin, a yieldable lever for each pin and on each rotating support to rotate therewith, and control means to slide said wheels when the end of said pattern has been reached to align one or the other of said wheels with its corresponding pin for rotation thereby, each pin being so disposed with respect to its corresponding wheel that when alignment therebetween is first made the pin will first engage the periphery of said wheel and be moved idly in its slotdue to yielding of said lever as said rotating support turns and thereafter enters a notch to effect movement of said wheel and said pattern to the extent of one-half of said normal distance in the opposite direction that the pattern had been previously moved by the other pin, whereafter said pin will operate to enter 17 the notches one at a time to move said paper said selected distance until sliding of said wheels occurs again.

29. 'In a loom dobby operating with movable perforated paper pattern of predetermined length partially trained around a rotatable cylinder fast on a cylinder shaft, a pair of intermittently rotatable wheels on said shaft operating one at a time to first move the paper in one direction toward the center of the loom until one end of said length is reached and then operating in a direction away from the center of the loom until the other end of said length is reached, a pair of oppositely rotating means for said wheels, one of which operates to move the paper toward the center of the loom until said one end of said length is reached and the other of which operates to move the paper away from the center of the loom until the said other end of said length is reached, unidirectional rotatable control means on a cross shaft to effect coaction of one of said oppositely rotating means with one of said wheels to move the pattern toward the center of the loom until one end of said length is reached, whereafter said control means operates to eifect coaction of the other of said oppositely rotating means with the other of said wheels to move the pattern away from the center of the loom until the other end of said length is reached, and visual aid means on said cross shaft to signify the direction of movement of said pattern.

30. The loom dobby set forth in claim 29 wherein said visual aid means includes a relatively thin disk rotatable with said control means and provided with indicia thereon angularly spaced on one side of said disk adjacent the periphery thereof to signify the direction of movement of said pattern relative to the center of the loom, and a stationary horizontal lever adjacent said one side and having a window therein through which said indicia are visible one at a time to read said direction of movement of said pattern. 7

31. In a loom dobby operating with harness frames selectable for reciprocation to form warp sheds to weave a fabric of predetermined length during loom operation, a paper pattern movable intermittently in two directions having odd and even sets of pairs of transverse rows of perforations in a predetermined area of said pattern to effect selection of said frames for said reciprocation, said pattern also having a hole outside of and at each end of said area in transverse alignment with the last row of holes in the last set of perforations at each end of said area, a series of vertically reciprocating reading needles transverse of said paper pattern at a reading station to which said sets are moved to read the pattern between movements thereof, one of said sets being read for the length of said predetermined area when the pattern moves in one of said two directions to eifect weaving of half of said predetermined length of fabric and the other of said sets being read for the length of said predetermined area when the paper moves reversely of said one of said two directions to effect weaving of the remaining half of said predetermined length of said fabric, a reading needle forming part of said series and located outside of said predetermined area to enter said hole at said each end of said area when either hole arrives at said reading station, and electric switch means operatively connected to said reading needle to initiate a change in direction of movement of said pattern when said needle enters one of said holes.

32. In a loom dobby operating with a cylinder on a cylinder shaft to progressively move a paper pattern intermittently first in one direction for a predetermined said one direction when said length of said pattern and thereafter progressively move said pattern intermittently in a direction opposite to said one direction, a pair of interconnected wheels having notches along the peripheries thereof and slidably secured to said shaft to slide from one to another of two occupative positions, a pair of oppositely rotating force applying pins, one to intermittently rotate said wheels in wheels are in one of said two occupative positions and the other one to intermittently rotate said wheels in the opposite direction when said Wheels are in the other of said two occupative positions, said force applying pins being staggered with respect to one of said wheels and one of said pins being aligned with the notches of one of said wheels when the latter is in either of said two occupative positions, pattern controlled means to effect sliding of said wheels from one to another of said occupative positions when an end of said predetermined length of pattern is reached, and a pair of yielding lock means, one for each wheel acting one at a time to enter said notches, to prevent excess rotation thereof in either of said directions when one or the other of said pins operates to turn said wheels.

33. The dobby set forth in claim 32 wherein said lock means includes a pair of transversely spaced levers pivoted at one end thereof to a common mount, a transverse pin extending from each other end of each lever across said wheels, a collar slidable on each pin, spring means biased with respect to said levers to exert a downward force to said collars to maintain the latter operatively connected to their respective wheels, a pair of transversely spaced flanges for each collar to straddle one of said wheels for continued registry therewith when said wheels slide from one occupative position to another, a circular central portion between each of said pair of flanges to enter the notches and to ride on the periphery of said wheels depending upon which occupative position the wheels are located.

34. In a reversing mechanism unit for a loom dobby having dobby plates and a series of fingers to selectively control harness frame lifting hooks movable by reciprocating means to effect raising or lowering of harness frames depending upon which direction said means are moving, said unit including a reversible paper pattern on a shaft to control said fingers, a pair of pattern windup rolls, each on a shaft parallel to said first shaft, common drive means between said shaft and said reciprocating means to efiect intermittent movement of said pattern means and said rolls first in one direction and then subsequently in the opposite direction while elfecting constant movement of said reciprocating means during loom operation, and support means on said dobby plates for said shafts, said common drive means and said rolls to confine said unit to a comparatively small space outside of said dobby plates, said common drive including a shaft having a gear at one end thereof meshing with a complementary gear to effect said intermittent movement and also having a crank arm at the other end thereof operatively connected to said reciprocating means to efiect said constant movement of said reciprocating means.

References Cited in the file of this patent UNITED STATES PATENTS 

